/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.anosine.gpsl.android.util.zxing.view;

import android.app.Activity;

import java.util.concurrent.*;
/**
 * @Title: InactivityTimer
 * @Package com.anosine.gpsl.android.util.zxing.view
 * @Description: 
 * @author: sunny
 * @date: 2015-11-25
 * @version V1.0
 */
/**
 * Finishes an activity after a period of inactivity.
 */
public final class InactivityTimer
{
	private static final int				INACTIVITY_DELAY_SECONDS	= 2 * 60;
//    private static final int				INACTIVITY_DELAY_SECONDS	= 10;
	private final ScheduledExecutorService	inactivityTimer				= Executors
																				.newSingleThreadScheduledExecutor(new DaemonThreadFactory());
	private final Activity					activity;
	private ScheduledFuture<?>				inactivityFuture			= null;

	public InactivityTimer(Activity activity)
	{
		this.activity = activity;
		onActivity();
	}

	public void onActivity()
	{
		cancel();
		inactivityFuture = inactivityTimer.schedule(new FinishListener(activity), INACTIVITY_DELAY_SECONDS,
				TimeUnit.SECONDS);
	}

	private void cancel()
	{
		if (inactivityFuture != null)
		{
			inactivityFuture.cancel(true);
			inactivityFuture = null;
		}
	}

	public void shutdown()
	{
		cancel();
		inactivityTimer.shutdown();
	}

	private static final class DaemonThreadFactory implements ThreadFactory
	{
		public Thread newThread(Runnable runnable)
		{
			Thread thread = new Thread(runnable);
			thread.setDaemon(true);
			return thread;
		}
	}
}
